125221506 has 16 divisors (see below), whose sum is σ = 250566048. Its totient is φ = 41720000.

The previous prime is 125221477. The next prime is 125221511. The reversal of 125221506 is 605122521.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13081 + ... + 20531.

It is an arithmetic number, because the mean of its divisors is an integer number (15660378).

Almost surely, 2^125221506 is an apocalyptic number.

125221506 is an abundant number, since it is smaller than the sum of its proper divisors (125344542).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

125221506 is a wasteful number, since it uses less digits than its factorization.

125221506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10257.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 125221506 is about 11190.2415523527. The cubic root of 125221506 is about 500.2951670519.

It can be divided in two parts, 12522 and 1506, that added together give a triangular number (14028 = T₁₆₇).

The spelling of 125221506 in words is "one hundred twenty-five million, two hundred twenty-one thousand, five hundred six".